DE102009029736A1 - Baking plate for an oven - Google Patents

Abstract

The invention relates to a mixture for producing a baking plate for an oven for the production of bread rolls, bread, etc., wherein the mixture comprises the following constituents: CaO, SiO 2, Al 2 O 3 and SiC.

Description

The The present invention relates to a mixture for producing a Baking plate for an oven for making rolls, bread, etc. and a Method for producing a baking plate from such a mixture.

Ovens for Production of bread and rolls as well as of cakes are known from old age. Until today Time are also built so-called stone ovens, with such stone ovens a substantially optimal baking result in the production, for example of bread is achieved. This is essentially because the Heat transfer values and here in particular the thermal conductivity and the radiative properties of the ceramic surfaces such stone ovens reach almost optimal values.

Furthermore are ovens known, which are lined with fireclay. Such ovens with chamotte however, have the disadvantage that the chamotte has poor thermal conductivity values having. Therefore, it takes a very long time for the stones to heat up are.

Now are also so-called deck ovens known where in several floors one above the other the baked goods are baked. Known in this context is the Use of concrete slabs. These concrete slabs form the base for the Baked goods. They have the function to store heat and conduct heat. conventional However, concrete slabs have the disadvantage that they only small Have thermal conductivity values. In ovens becomes common baked with falling temperature. That is, the heating after the Baking process must be economical establish preferably go fast. The speed with which the stove is heated can be dependent from the absorption of radiant heat through the concrete slabs and their thermal conductivity. Is this bad, The heating process takes too long, so a baking "shot up Shot "not possible.

adversely When using concrete slabs is still that the concrete slabs already after a few baking processes due to temperatures up to 350 ° C its strength due to destruction of the CS-H and CA-H phases, hence the concrete structure, lose.

The is called, the former concrete slab no longer turns into a concrete slab but rather has flap-shaped Character, whereby only the reinforcement of glass fibers prevents that the "plate" breaks completely. About that addition, the baking result itself, based on a stone oven, only suboptimal. The reason for this is that the heat transfer values These known concrete slabs are rather bad.

The The object underlying the invention is therefore to to provide a baking plate, on the one hand, over a nearly unlimited Lifespan has and above also shows optimal values with respect to the baking result. That means, that such a baking plate is particularly suitable when they is able to heat well to store, heat to conduct and radiant heat to absorb well.

To achieve the object, a mixture for producing a baking plate for an oven for the production of bread, rolls, etc. is proposed, which is characterized in that the mixture comprises the following components:
CaO, SiO 2, Al 2 O 3, SiC

Especially By the addition of silicon carbide (SiC) is achieved that the baking plate made from such a mixture gives optimum heat transfer values, and in particular has an optimal thermal conductivity.

Specifically, it is envisaged that the proportion of the individual constituents in percentage by mass is as follows: Al2O3 5-80% by weight SiO2 3-80% by weight CaO 0,5-5 Ma .-% SiC 5-90% by weight

sowie mindestens ein Zuschlagstoff, z. B. Schamottekörnung mit einem Anteil von 0–60 Ma.-%Furthermore, it is provided according to a feature of the invention that to provide the inventory parts of the above mixture find the following substances in the mixture:

and at least one additive, for. B. chamotte grain with a proportion of 0-60 Ma .-%

object The invention is also a method for producing a Baking plate with a mixture of z. Reactive alumina, microsilica, Alumina cement, concrete liquefier and SiC, which is characterized in that the mixture by adding liquefied by water will that liquefied Mixture is placed in a mold, in particular a compaction the mass is done by vibration. After curing (hydraulic binding) the plates are demolded and then at elevated temperature in the range from 80-150 ° C, and here especially in the range of 120 ° C, dried to a residual moisture content of 2% by mass, dehydration takes place at about 200 ° C. to 320 ° C., in particular 300 ° C., during the drying, and subsequently a ceramic solidification in the temperature range between 950 ° C and 1200 ° C, in particular at 1000 ° C, he follows.

at The production of such plates has continued to be advantageous It turns out that these, even if they are only a strength of about 15 mm, essentially not warped. That is, they are ceramic burnt flat plates can be produced with only slight delay.

Based on a recipe, the invention will be explained in more detail below. example recipe Content /% by mass Al2O3 SiO2 CaO SiC Chamotte grain 0-3 mm 51 22 25 0 0 SiC fine grain 0-1 mm 27 0 1 0 26 Aluminous cement 6 4 0 2 0 microsilica 5 0 5 0 0 reactive alumina 10 10 0 0 0 Concrete plasticizer 1 0.9 0 0 0 100 36.9 31 2 26

The Fireclay grain Here is the aggregate.

The Mixture is liquefied with water, placed in a mold, and in the mold by creating a hydraulic Bond hardened. After removing the plate from the mold, the drying is carried out at about 120 ° C to a residual moisture content of 2 wt .-% water. following the plate is dehydrated at 300 ° C. During dehydration, the OH groups are split off at elevated temperature. Here, the hydraulic binding phase [CA-H and CS-H phase] destroyed. Subsequently, the product is fired at about 1000 ° C. This takes place in the plate, which at that time still as a slab concrete slab can denote a ceramic transformation instead. The plate is Permanently resistant at service temperatures of approximately 1000 ° C. Especially find at the temperatures prevailing in the oven of up to 350 ° C none structural changes more instead.

Claims (5)

Mixture for producing a baking plate for an oven for the production of bread rolls, bread, etc., characterized in that the mixture comprises the following constituents: CaO, SiO 2, Al 2 O 3 and SiC. Mixture for producing a baking plate for an oven for the production of bread rolls, bread, etc., according to claim 1, characterized in that the proportions in the mixture are chosen as follows: Al2O3 5-80% by weight SiO2 3-80% by weight CaO 0,5-5 Ma .-% SiC 5-90% by weight Mixture for making a baking plate for a Oven for making bread rolls, Bread, etc., according to any one of the preceding claims,  characterized, that the mixture comprises the following substances: reactive alumina microsilica Aluminous cement Concrete plasticizer silicon carbide such as at least one additive, eg. B. chamotte grain. Process for producing a baking plate from a Mixture according to one or more of the preceding claims, characterized that the mixture is liquefied by adding water that the liquefied mixture in a mold, wherein after the hydraulic setting the stolen plate first at elevated Temperature dried to a residual moisture content of about 2 wt .-% water is, after drying dehydration at about 200 ° to 320 ° C, in particular takes place at 300 ° C, and subsequently a ceramic solidification at about 950 ° to 1200 ° C, in particular at 1000 ° C, takes place. Method according to claim 5, characterized in that that the drying at temperatures of 80 ° to 150 ° C, in particular to about 120 ° C made becomes.